diff --git a/src/prune.jl b/src/prune.jl
index 7b1812c..58b664b 100644
--- a/src/prune.jl
+++ b/src/prune.jl
@@ -122,7 +122,7 @@ end
 
 function prune_strictly_dominated!(tree::SARSOPTree, eps=1e-10)
     Γ = tree.Γ
-    Γ_new_idxs = []
+    Γ_new_idxs = Int[]
 
     for (α_try_idx, α_try) in enumerate(Γ)
         marked_for_deletion = falses(length(Γ_new_idxs))